#define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>

int main()
{
	int num = 0;
	while (scanf("%d", &num) != EOF)
	{
		for (int i = 0; i < num; i++)
		{
			for (int j = 0; j < num; j++)
			{
				if (i == 0 || j == 0 || i == num - 1 || j == num - 1)
				{
					printf("* ");
				}
				else
				{
					printf("  ");
				}
			}
			printf("\n");
		}
	}
	return 0;
}